If McConnell or Boehner had any guts they’d say:
“Well Lucy, You can take that football and shove it where the sun don’t shine!”
Whimpy’s line, about: “I’ll gladly pay you tomorrow, for a hamburger today.”, is also apt, but the reference is a bit dated for most.
It will be easy to know when Mc Connel is ready to cave. He will give a very tough-talking, conservative’s dream speech on the Senate floor immediately preceding his total capitulation.